Try this:
1 Apple menu
2 system preferences
3 security
4 click require password to unlock each pref pane
5 reboot 

The names might differ some as i dont remember 100% but they should be very 
similar.
This Will likely resolve ur issue. 

Best regards
Nicklas

Sent from my iPhone

On 10 sep 2010, at 11:00, Jason Davies <ophioc...@gmail.com> wrote:

> Tilly wrote:
>> I love Macs - I opened my laptop this morning having put it to sleep
>> after fruitlessly trying to connect for ages and first time I try to
>> get onto the Web I'm there. Not sure how, but it's the Mac magic that
>> somehow sorts itself out in the end... It looks like I must have
>> managed to get onto the VPN as there is no wifi 'fan' on the top menu.
>> anyway thanks guys. You may be right that the IT department here would
>> have been helpful but in the end I didn't need to test it.
>>   
> it sounds like it renewed the DHCP lease. If it goes wrong again, you can 
> renew that manually in Sys Prefs/Network/Airport/Advanced then click on 
> TCP/IP to see the button.
> 
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